JPWO2018083719A1 - Ignition device for internal combustion engine - Google Patents

Abstract

Provided is an igniter for an internal combustion engine capable of maintaining stable combustion without prolonging the time for which a main primary coil is energized. A primary primary coil 111a that generates a forward magnetic flux when energized by the main switch element 12, and a secondary primary that generates a forward magnetic flux when energized in the first direction and a reverse magnetic flux when energized in the second direction. The coil 111b and the secondary coil 112 on which the magnetic fluxes of the main primary coil 111a and the sub-primary coil 111b act constitute the ignition coil 11, and the direction of energization to the main primary coil 111b and the energization / cutoff timing are controlled. The sub-primary coil magnetic flux generation state switching unit 5 for switching the magnetic flux generation state of the sub-primary coil 111b is provided, and the ignition control means 31 performs an operation instruction to the main switch element 12 and the sub-primary coil magnetic flux generation state switching unit 5. The discharge energy given to the secondary side is adjusted to efficiently maintain the stable combustion of the internal combustion engine.

Description

  The present invention relates to an ignition device for an internal combustion engine mounted on a motor vehicle, and discharge energy generated on the secondary side of an ignition coil is increased in a superimposed manner to obtain good discharge characteristics.

  Although direct injection engines and high EGR engines are adopted for fuel efficiency improvement as internal combustion engines mounted in vehicles, since these engines have poor ignition performance, high energy type of ignition devices are required. Become. Therefore, a phase discharge type ignition device has been proposed in which the output of another ignition coil is additionally superimposed on the ignition coil secondary side output generated by the classical current interruption principle (for example, Patent Document 1) See).

  According to the igniter described in Patent Document 1, a high voltage of several kilovolts generated on the secondary side of the primary primary ignition coil by interrupting the primary current causes dielectric breakdown in the discharge gap of the spark plug. After the discharge current starts to flow from the secondary side of the ignition coil, the primary current of the sub ignition coil connected in parallel with the main ignition coil is shut off, and several kV of DC voltage generated on the secondary side is added By superimposing, since a large discharge energy can be given to the spark plug over a relatively long time, the ignitability to the fuel is improved, and the fuel consumption is also improved.

JP, 2012-140924, A

  However, in a system such as the ignition device described in Patent Document 1, since the discharge current of the spark plug is determined by the combination of triangular currents output from the respective coils, in order to extend the high current period, It is necessary to increase the time for storing sufficient energy in the two ignition coils while increasing the ignition phase of the ignition coil. As described above, if the current application time to the primary coil is extended in addition to the use of two ignition coils, there arises a problem that the size of the coil main body is increased and the heat generation of the switching element for controlling the current application to the primary coil is increased.

  Further, as a method of increasing the energy accumulated in the primary coil without lengthening the time for which the primary coil is energized, a method of increasing the stored energy by increasing the size of the coil and a method of using a plurality of ignition coils can be considered. However, if a large ignition coil or a plurality of ignition coils are used, securing of the mounting space becomes a problem.

  Furthermore, by boosting the power supply voltage outside or inside the ignition coil and applying a high voltage directly to the secondary side of the coil, the discharge energy on the secondary side can be increased without prolonging the time for which the primary coil is energized. There is also a way to increase However, in such a method, the power supply voltage has to be boosted to about several kilovolts, so that the withstand voltage of the mounted booster circuit needs to be increased and the connection resistance at high voltage is required, resulting in a considerable increase in cost.

  Therefore, according to the present invention, a stable high current period can be secured without prolonging the energization time of the main primary coil, and combustion can be maintained, and moreover, the increase in size and cost of the ignition coil can be suppressed. An object of the present invention is to provide an ignition device for an internal combustion engine.

  In order to solve the above-mentioned problems, the invention according to claim 1 comprises a main primary coil in which the forward magnetic flux is increased by energization and the forward magnetic flux is reduced by interrupting a current, and a first predetermined primary coil The secondary primary coil generates forward magnetic flux due to current flow in the direction and generates reverse magnetic flux reverse to the forward direction due to current flow in the opposite second direction, and one end is connected to the spark plug, and the main primary coil And an ignition coil having a secondary coil for generating discharge energy by the action of magnetic flux generated in the secondary primary coil, main switch means for switching between energization and disconnection from the battery to the main primary coil, and the secondary primary coil Switching between the forward magnetic flux generation state capable of supplying current in the first direction and the reverse magnetic flux generation state capable of supplying current in the second direction to the sub-primary coil, and switching to the forward magnetic flux generation state The secondary primary coil flux generation state switching means provided with the first secondary switch means used for control, and the main switch means and the secondary primary coil magnetic flux generation state switching means are controlled to discharge the spark plug at a predetermined timing of the combustion cycle. An ignition control means for generating a spark, wherein the ignition control means is capable of main normal discharge control for generating discharge energy in a secondary coil by control of energization / cutoff to the main primary coil; Pre-ignition timing superimposed discharge control that switches the primary coil flux generation state switching means to forward flux generation state and simultaneously energizes the primary primary ignition coil and secondary primary ignition coil, and / or secondary primary coil flux generation state after ignition timing Ignition timing that switches the switching means to the reverse magnetic flux generation state to energize and shut off the secondary primary ignition coil Post superimposed discharge control, characterized in that to allow the.

  The invention according to claim 2 is the igniter for an internal combustion engine according to claim 1, wherein the secondary primary coil magnetic flux generation state switching means sets the first secondary switch means to the primary primary coil. Is used as a switch to switch the first end side of the sub primary coil to ground so that current can be supplied in the first direction, and to the second end side of the sub primary coil so that current can be supplied to the sub primary coil in the first direction. Second sub-switching means capable of supplying power from the feeding means; third sub-switching means for switching the second end side of the sub-primary coil to the ground so that current can be supplied to the sub-primary coil in the second direction; And a fourth sub-switch means capable of supplying power from the second power supply means to the first end of the sub-primary coil so that power can be supplied to the sub-primary coil in the second direction.

  The invention according to claim 3 is the igniter for an internal combustion engine according to claim 2, wherein the ignition control means controls on / off of the main switch means, the first sub switch means and the second sub switch means. By performing in synchronization with each other to perform superimposed discharge control before ignition timing in which the main primary ignition coil and the secondary primary ignition coil are simultaneously energized.

  According to a fourth aspect of the present invention, in the ignition device for an internal combustion engine according to the second aspect, the ignition control means is configured to control the third primary after the ignition timing at which the main primary coil is controlled to be energized or de-energized. By performing ON / OFF control of the switch means and the fourth sub-switch means, it is characterized in that after the ignition timing, superimposed discharge control is performed to increase discharge energy generated in the secondary coil in a superimposed manner.

  The invention according to claim 5 is the ignition device for an internal combustion engine according to claim 2, wherein the ignition control means controls on / off of the main switch means, the first auxiliary switch means and the second auxiliary switch means. The third sub-switch means and the third sub-switch means and the ignition timing after the pre-ignition timing superimposing discharge control in which the main primary ignition coil and the sub-primary ignition coil are energized simultaneously and the pre-ignition timing superimposing discharge control. By performing ON / OFF control of the fourth auxiliary switch means, after ignition timing superimposed discharge control to increase discharge energy generated in the secondary coil in a superimposed manner is performed within the same combustion cycle. I assume.

  The invention according to claim 6 is the ignition device for an internal combustion engine according to any one of claims 3 to 5, wherein the ignition signal outputted from the ignition control means is a main switch means and It is characterized in that the ON / OFF operations of the main switch means and the first sub switch means are synchronized by being simultaneously input to the 1 sub switch means.

  The invention according to claim 7 is the ignition device for an internal combustion engine according to any one of claims 2 to 6, wherein at least the second auxiliary of the secondary primary coil magnetic flux generation state switching means. The switch means, the third sub-switch means and the fourth sub-switch means are housed in one case to be unitized.

  The invention according to claim 8 is the igniter for an internal combustion engine according to any one of claims 1 to 7, wherein the main switch means and the first sub switch means are in the case of the ignition coil. It is characterized by being housed in

  The invention according to claim 9 is the igniter for an internal combustion engine according to claim 8, wherein a control terminal for controlling ON / OFF of the main switch means and the first sub switch means is in a case of an ignition coil. It is characterized in that the external connection terminal connected and connected to the ignition control means is shared.

  The invention according to claim 10 is the igniter for an internal combustion engine according to claim 1, wherein the ignition control means switches the secondary primary coil magnetic flux generation state switching means to a forward magnetic flux generation state, and the main discharge Instead of the control, it is characterized in that a sub-normal discharge control that generates discharge energy in the secondary coil can be performed by the energization / detachment control to the sub-primary coil.

  The invention according to claim 11 is the igniter for an internal combustion engine according to claim 2, wherein the ignition control means synchronizes ON / OFF control of the first auxiliary switch means and the second auxiliary switch means. By switching to the forward magnetic flux generation state by doing, instead of the main discharge control, secondary normal discharge control is performed to generate discharge energy in the secondary coil by energization / shutdown control to the secondary primary coil. I assume.

  The invention according to claim 12 is the igniter for an internal combustion engine according to claim 11, wherein the ignition control means controls ON / OFF of the main switch means, the first auxiliary switch means and the second auxiliary switch means. By performing in synchronization with each other to perform superimposed discharge control before ignition timing in which the main primary ignition coil and the secondary primary ignition coil are simultaneously energized.

  The invention according to claim 13 is the igniter for an internal combustion engine according to claim 11, wherein the ignition control means is configured to control the third auxiliary after the main normal discharge control or the auxiliary normal discharge control. By performing ON / OFF control of the switch means and the fourth sub-switch means, it is characterized in that after the ignition timing, superimposed discharge control is performed to increase discharge energy generated in the secondary coil in a superimposed manner.

  The invention according to claim 14 is the igniter for an internal combustion engine according to claim 11, wherein the ignition control means controls ON / OFF of the main switch means, the first auxiliary switch means and the second auxiliary switch means. The third sub-switch means and the third sub-switch means and the ignition timing after the pre-ignition timing superimposing discharge control in which the main primary ignition coil and the sub-primary ignition coil are energized simultaneously and the pre-ignition timing superimposing discharge control. By performing ON / OFF control of the fourth auxiliary switch means, after ignition timing superimposed discharge control to increase discharge energy generated in the secondary coil in a superimposed manner is performed within the same combustion cycle. I assume.

  The invention according to claim 15 is the igniter for an internal combustion engine according to any one of claims 11 to 14, wherein the ignition control means sends the main ignition signal to the main switch means, and sub-ignitions. The present invention is characterized in that ON / OFF operations of the main switch means and the first sub switch means are synchronized by outputting a signal to the first sub switch means.

  The invention according to claim 16 is the igniter for an internal combustion engine according to any one of claims 2 to 7 and claims 11 to 15, wherein the first power feeding means It is characterized in that the battery used to supply power to the main primary coil is shared.

  The invention according to claim 17 is the igniter for an internal combustion engine according to any one of claims 2 to 7 and claim 11 to 16, wherein the ignition control means comprises the sub-primary. The present invention is characterized in that the power supplied from the second power supply unit to the secondary primary coil can be adjusted by performing PWM control on the fourth switch unit of the coil magnetic flux generation state switching unit.

  According to an eighteenth aspect of the present invention, in the ignition device for an internal combustion engine according to any one of the first to sixth aspects and the tenth to seventeenth aspects, at least the secondary primary coil magnetic flux generation state The switching means is characterized in that it is housed in one case and unitized.

  According to the igniter for an internal combustion engine according to the present invention, by including the secondary primary coil magnetic flux generation state switching means, it is possible to perform superimposed discharge control before ignition timing and superimposed discharge control after ignition timing. Necessary and sufficient discharge energy is superimposed from the secondary primary coil to the secondary coil, and a stable high current period is secured without prolonging the current application time to the main primary coil, and suitable combustion is realized. In addition, a high fuel efficiency improvement effect can be expected by using the pre-ignition superimposed discharge control and the post-ignition superimposed discharge control according to the operation conditions. In addition, since a plurality of coils and a booster circuit are not required, it is possible to suppress an increase in size and cost of the ignition coil.

It is a schematic block diagram which shows 1st Embodiment of the internal combustion engine ignition device which concerns on this invention. FIG. 5 is a waveform diagram schematically showing waveforms of respective portions in a combustion cycle when main normal discharge control is performed by the internal combustion engine ignition device according to the first embodiment. FIG. 5 is a waveform diagram schematically showing waveforms of respective portions in a combustion cycle when the pre-ignition timing superimposed discharge control is performed by the internal combustion engine ignition device according to the first embodiment. FIG. 6 is a waveform diagram schematically showing waveforms of respective portions in a combustion cycle when performing post-ignition superimposed discharge control by the internal combustion engine ignition device according to the first embodiment. FIG. 6 is a waveform diagram schematically showing waveforms of respective portions in a combustion cycle when the pre-ignition superimposed discharge control and the post-ignition superimposed discharge control are performed by the internal combustion engine ignition device according to the first embodiment. It is a schematic block diagram which shows 2nd Embodiment of the internal combustion engine ignition device which concerns on this invention. It is a schematic block diagram which shows 3rd Embodiment of the internal combustion engine ignition device which concerns on this invention. FIG. 13 is a waveform diagram schematically showing waveforms of respective portions in a combustion cycle when sub-normal discharge control is performed by the internal combustion engine ignition device according to the third embodiment.

  Next, an embodiment of an internal combustion engine ignition device according to the present invention will be described in detail based on the attached drawings.

  FIG. 1 shows an ignition device 1 for an internal combustion engine according to a first embodiment of the present invention, and an ignition coil unit 10 for generating discharge sparks in one spark plug 2 provided for each cylinder of the internal combustion engine; Internal combustion engine drive control device 3 provided with ignition control means 31 for outputting an ignition signal Si etc. instructing the operation timing of the ignition coil unit 10 at appropriate timing, DC power supply 4 such as vehicle battery, secondary primary coil magnetic flux generation state It comprises switching unit 5 grade.

  In the internal combustion engine ignition device 1 shown in the present embodiment, the ignition control means 31 is included in the internal combustion engine drive control device 3 that comprehensively controls the internal combustion engine of the automobile, but is limited thereto It is not a thing. For example, in response to the ignition signal generated by the ignition signal generation function of the normal internal combustion engine drive control device 3, an appropriate control signal is output to the ignition coil unit 10 and the secondary primary coil magnetic flux generation state switching unit 5 Alternatively, ignition control means may be provided separately.

  In the ignition coil unit 10, for example, the ignition coil 11, the main switch element 12, the bypass line 13 provided in parallel with the main switch element 12, the rectifying means 14 provided in the bypass line 13, etc. It is an integrated unit. A high voltage terminal 151 and a connector 152 are provided at appropriate places of the case 15, and the spark plug 2 is connected via the high voltage terminal 151, and the connector 152 (for example, the first connection terminal 152a to the sixth connection terminal 152f It connects with internal-combustion-engine drive control apparatus 3, DC power supplies 4, such as a vehicle battery, the secondary primary coil magnetic flux generation | occurrence | production state switching unit 5, and earthing | grounding point GND via the provided connector.

  The ignition coil 11 includes a main primary coil 111a (for example, 90 turns), a sub primary coil 111b (for example, 60 turns), and a secondary coil 112 (for example, 9000 turns). The ignition coil 11 causes the magnetic flux generated in the main primary coil 111a and the sub primary coil 111b to act on the secondary coil 112. For example, the main primary coil 111a and the sub primary coil 111b are arranged to surround the center core 1113. And the secondary coil 112 is disposed outside the same.

  One end of the main primary coil 111a is connected to, for example, the DC power supply 4 via the second connection terminal 152b, and a power supply voltage VB + (for example, 12 V) is applied. The other end of main primary coil 111a is connected to ground GND via main switch element 12 and fifth connection terminal 152e.

  The main switch element 12 is a main switch means for energizing / shutting off the main primary coil 111a, and is configured using, for example, an IGBT (Insulated Gate Bipolar Transistor). That is, the ignition coil unit 10 has a unit structure in which the ignition coil and the igniter are sealed in the case 15. The gate G, which is a control terminal of the main switch element 12, is connected to the internal combustion engine drive control device 3 via, for example, the fourth connection terminal 152d, and ON / OFF controlled by the ignition signal Si generated by the ignition control means 31. Ru.

  As described above, when the main switch element 12 is turned ON by the ignition signal Si and the main primary coil 111a is energized, the main primary current I1a flows to increase the magnetic flux in the forward direction, and the main switch element 12 is turned OFF. When the main primary current I1a is cut off, the forward magnetic flux is rapidly reduced, and a high voltage is generated on the secondary coil 112 side so as to generate a magnetic field in a direction that impedes this magnetic flux change, A discharge spark is generated between the discharge gaps of the spark plug 2 and a secondary current I2 flows. As described above, control for causing the spark plug 2 to discharge by energization / cutoff control for the main primary coil 111a is hereinafter referred to as main normal discharge control.

  One end of the secondary coil 112 is connected to the spark plug 2 via the high voltage terminal 151, and the other end is connected to the ground point GND via a sixth connection terminal 152f. A current detection resistor 61 is provided between the sixth connection terminal 152f and the ground point GND so that the secondary current detection signal Di2 is supplied to the internal combustion engine drive control device 3.

  In the internal combustion engine drive control device 3, by monitoring this secondary current I2, it is possible to know the operating condition of the engine, and together with other information such as the number of revolutions of the engine If the discharge energy given to the secondary coil 112 is insufficient, the discharge energy is increased. Conversely, if the discharge energy applied to the secondary coil 112 is excessive, the discharge energy is appropriately reduced. Can expect high fuel efficiency improvement effect. In order to do this, the ignition control means 31 of the internal combustion engine drive control device 3 controls the operation of the secondary primary coil flux generation state switching unit 5 so that an appropriate magnetic flux is generated from the secondary primary coil 111b at an appropriate timing. is there.

  Here, the secondary primary coil 111b in which the direction of energization and the energization / shutoff timing are controlled by the secondary primary coil magnetic flux generation state switching unit 5 will be described.

  The secondary primary coil 111b is energized in a predetermined first direction (for example, in the direction from the first end 111b1 which is one end of the secondary primary coil 111b to the second end 111b2 which is the other end), and the forward magnetic flux is Magnetic flux that is generated in the reverse second direction (for example, the direction from the second end 111b2 to the first end 111b1) in the reverse direction opposite to the forward direction (a magnetic field generated on the secondary side by main normal discharge control) Magnetic flux in the same direction as

  The first end 111b1 of the secondary primary coil 111b is connected to the secondary primary coil magnetic flux generation state switching unit 5 via, for example, the third connection terminal 152c, and the second end 111b2 of the secondary primary coil 111b is, for example, a first connection It is connected to the secondary primary coil magnetic flux generation state switching unit 5 via the terminal 152a. Therefore, when the secondary primary coil magnetic flux generation state switching unit 5 sets the first end 111b1 of the secondary primary coil 111b to the feed side and the second end 111b2 to the ground side, the secondary primary coil 11b is energized in the first direction. It becomes. Conversely, when the secondary primary coil flux generation state switching unit 5 sets the second end 111b2 of the secondary primary coil 111b to the power supply side and the first end 111b1 to the ground side, the secondary primary coil 11b is energized in the second direction. It will be.

  The first direction and the second direction of the secondary primary coil 111b are determined by the arrangement of the primary primary coil 111a. For example, when the winding direction of the sub-primary coil 111b and the winding direction of the main primary coil 111b are arranged to be the same, if the same direction as the energization direction to the main primary coil 111b is used as the first direction The magnetic flux in the forward direction is generated in the secondary primary coil 111b. Conversely, when the winding direction of the sub primary coil 111b and the winding direction of the main primary coil 111b are arranged in opposite directions, the current flowing in the reverse direction to the main primary coil 111b is the first direction. For example, forward magnetic flux is generated.

  When the secondary primary coil 111b configured as described above is energized in the first direction at the same timing as the main normal discharge control by the above-described primary primary coil 111a, the same forward magnetic flux as the primary primary coil 11a is generated Then, if current supply to the sub-primary coil 111b is interrupted at the same timing as the main normal discharge control, the forward magnetic flux of the main primary coil 111a and the sub-primary coil 111b rapidly decrease simultaneously, so discharge energy to be given to the secondary side It can be enhanced. That is, the forward magnetic flux is generated by the secondary primary coil 111b before the ignition timing (prior to the timing at which the primary primary coil 111a is de-energized), and de-energization of the secondary primary coil 111b simultaneously with the primary primary coil 111a is performed. For example, discharge energy can be superimposed on the secondary coil 112 by the secondary primary coil 111b.

  In addition, when the secondary primary coil 111b is energized in the second direction at an appropriate timing after the ignition timing (after the timing at which the main primary coil 111a is de-energized), magnetic flux in the reverse direction (high on the secondary side) A magnetic flux (in the same direction as the magnetic field that generates the voltage) is generated, and it is possible to suppress the fall of the secondary side electromotive force by attenuating the magnetic field on the secondary side. The secondary current I2 can be maintained high. That is, if the magnetic flux in the reverse direction is generated by the secondary primary coil 111b after ignition timing and is made to act on the secondary coil 112, discharge energy can be superimposed and given to the secondary coil 112 by the secondary primary coil 111b.

  The timing for interrupting the secondary primary coil 111b in the second direction is when the necessary and sufficient time has elapsed for maintaining the secondary current I2 at a high current necessary for suitable combustion in the cylinder. However, if the secondary primary coil 111b is continuously energized in the second direction for a long time, the fuel efficiency will be deteriorated. The desired energization / shutdown timing for such a secondary primary coil 111b is not determined to be a fixed value, and changes variously depending on the structure of the internal combustion engine, the characteristics of the ignition coil, the operating conditions, etc. The ignition control means 31 of the internal combustion engine drive control device 3 may store in advance a setting value or setting information (such as an arithmetic expression for obtaining the setting value and a comparison table) suitable for 1.

  Further, when the second direction energization to the sub primary coil 111b is cut off, the back electromotive force acts on the main primary coil 111a, so that a current in the direction opposite to the normal primary current I1 tends to flow. As a voltage is applied between the collector and the emitter of the main switch element 12, there is a risk that the main switch element 12 may fail or the deterioration of the main switch element 12 may be accelerated. Therefore, while providing the bypass line 13 in parallel with the main switch element 12, the rectifying means 14 (for example, the collector side of the main switch element 12) is in the forward direction from the ground point GND side of the bypass line 13 toward the ignition coil 11 side. And a diode in which the anode is connected to the emitter side of the main switch element 12).

  Next, a secondary primary coil capable of alternately switching between a forward magnetic flux generation state in which the secondary primary coil 111b can be energized in the first direction and a reverse magnetic flux generation state in which the secondary primary coil 111b can be energized in the second direction. A configuration example of the sub primary coil magnetic flux generation state switching unit 5 which is a magnetic flux generation state switching means will be described. The secondary primary coil magnetic flux generation state switching unit 5 includes a first secondary switching device 51, a second secondary switching device 52, a third secondary switching device 53, and a fourth secondary switching device 54.

  The first sub switch element 51 functions as a first sub switch unit that switches the first end 111 b 1 side of the sub primary coil 111 b to the ground point GND so that power can be supplied to the sub primary coil 111 b in the first direction. For example, the first sub switch element 51 is formed of an insulated gate bipolar transistor for power control, and the collector C of the first sub switch element 51 is on the second end 111 b 2 side of the sub primary coil 111 b. The emitter E is connected to the ground point GND side, and the ignition signal Si is input to the gate G of the first sub switch element 51. Therefore, when the ignition signal Si is turned ON (for example, the signal level is H), the first auxiliary switching device 51 is turned ON, and the second end 111b2 of the auxiliary primary coil 111b is connected to the ground point GND.

  The second sub switch element 52 can supply power to the second end 111b2 side of the sub primary coil 111b from the first power feeding means (for example, the DC power supply 4) so that the sub primary coil 111b can be energized in the first direction. Function as a second secondary switch means. For example, the second sub switch element 52 is configured using a power MOS-FET having high speed switching characteristics, and the drain D of the second sub switch element 52 is on the DC power supply 4 side, and the source S of the second sub switch element 52 is Is connected to the first end 111b1 side of the sub-primary coil 111b, and the first direction energization instruction signal S1d from the ignition control means 31 is input to the gate G of the second sub-switch element 52. Therefore, when the first direction energization instruction signal S1d is turned ON (for example, the signal level is H), the second sub switching element 52 is turned ON, and the power supply voltage VB + from the DC power supply 4 to the first end 111b1 of the sub primary coil 111b. Will be applied.

  The third secondary switch element 53 functions as third secondary switch means for switching the second end 111b2 side of the secondary primary coil 111b to the ground point GND so that the secondary primary coil 111b can be energized in the second direction. For example, the third sub switch element 53 is configured using a power MOS-FET having high speed switching characteristics, and the drain D of the third sub switch element 53 is on the side of the first end 111b1 of the sub primary coil 111b. The source S of the switch element 53 is connected to the ground point GND side, and the second direction energization permission signal S2p from the ignition control means 31 is input to the gate G of the third sub switch element 53. Therefore, when the second direction energization permission signal S2p is turned ON (for example, the signal level is H), the third sub switch element 53 is turned ON, and the first end 111b1 of the sub primary coil 111b is connected to the ground point GND. It will be. A current detection resistor 62 is provided between the third sub switch element 53 and the ground point GND, and the sub primary current detection signal Di1s in the second direction is input to the internal combustion engine drive control device 3.

  The fourth sub switch element 54 can supply power to the first end 111 b 1 side of the sub primary coil 111 b from the second power feeding means (for example, the DC power supply 4) so that the sub primary coil 111 b can be energized in the second direction. Function as a second auxiliary switch means. For example, the fourth sub switch element 54 is configured using a power MOS-FET having high speed switching characteristics, and the drain D of the fourth sub switch element 54 is on the DC power supply 4 side, and the source S of the fourth sub switch element 54 is Is connected to the second end 111b2 side of the sub-primary coil 111b, and the second direction energization instruction signal S2d from the ignition control means 31 is input to the gate G of the fourth sub-switch element 54. Therefore, when the second direction energization instruction signal S2d is turned ON (for example, the signal level is H), the fourth sub switch element 54 is turned ON, and the power supply voltage VB + from the DC power supply 4 is applied to the second end 111b1 of the sub primary coil 111b. Will be applied. In order to increase the voltage applied to the secondary primary coil 111b, a higher voltage DC power supply may be used instead of the VB + DC power supply 4 as the first power supply or the second power supply. Alternatively, a booster circuit 7 (indicated by a two-dot chain line in FIG. 1) may be provided to increase the voltage applied to the sub primary coil 111b.

  Here, a control example of the ignition control means 31 with respect to the sub primary coil magnetic flux generation state switching unit 5 having the above-described structure will be described based on FIGS.

  FIG. 2 shows main normal discharge control, which is a basic control for giving discharge energy to the secondary coil 112 using only the main primary coil 111a during one combustion cycle.

  First, when the ignition signal Si is turned ON at a predetermined timing in the combustion cycle, the main switch element 12 is turned ON, and the main primary current I1a flows. When the ignition signal Si is turned ON, the first auxiliary switch element 51 of the auxiliary primary coil flux generation state switching unit 5 is also turned ON, and the second end 111b2 side of the auxiliary primary coil 111b is connected to the ground point GND. However, since the first direction energization instruction signal S1d remains OFF, energization of the sub primary coil 111b in the first direction is not performed.

  As time passes from the energization of the main primary coil 111a, the main primary current I1a increases until it reaches a saturation current, and energy is stored in the main primary coil 111a. Then, when the ignition signal Si is turned off at the ignition timing (when the signal level changes from H to L), an electromotive force corresponding to the energy stored in the main primary coil 111a is generated on the secondary side, and the secondary current I2 is As it flows, dielectric breakdown occurs between the electrodes of the spark plug 2 to generate a discharge spark in the cylinder (capacitive discharge). After that, discharge (inductive discharge) by discharge of magnetic energy given to the secondary coil 112 continues for about 0.5 to 2.5 ms, but the electromotive force generated in the secondary coil 112 gradually weakens, and the secondary current I2 Also, it may not be able to obtain a sufficient discharge spark to maintain a suitable combustion in the cylinder.

  In the above-described main / normal discharge control, the power applied to main primary coil 111a is constant at power supply voltage VB + of DC power supply 4, so the discharge energy applied from main primary coil 111a to secondary coil 112 is substantially constant. is there. Therefore, when it is necessary to supply a high discharge current to the spark plug 2 for a long time to maintain a stable combustion state, such as when the engine speed is low, the main primary coil 111a to the secondary coil 112 It is necessary to increase the discharge energy to be given, which requires increasing the ON time of the ignition signal Si and storing higher discharge energy in the main primary coil 111a. However, if the ON time of the ignition signal Si is increased, the heat generation of the main switch element 12 for controlling the energization of the main primary coil 111a becomes a problem, causing the main switch element 12 to malfunction or the life of the switch element 12 There is a risk of shrinking. Thus, in the internal combustion engine ignition device 1 according to the present embodiment, the discharge energy to be applied to the secondary coil 112 at the ignition timing is increased without increasing the ON time of the ignition signal Si by using the sub-primary coil 111b. It is possible to increase and extend the high current period.

  FIG. 3 shows pre-ignition superimposed discharge control in which the secondary primary coil magnetic flux generation state switching unit 5 is switched to the forward magnetic flux generation state to simultaneously energize the primary primary coil 111a and the secondary primary coil 111b. The energy stored in both the primary primary coil 111a and the secondary primary coil 111b is controlled to be applied to the secondary coil 112 at a stretch during the combustion cycle of

  First, at a predetermined timing in the combustion cycle, the ignition signal Si and the first direction energization instruction signal S1d are simultaneously turned ON, and the second direction energization permission signal S2p and the second direction energization instruction signal S2d are maintained OFF. The main switch element 12 and the first sub switch element 51 and the second sub switch element 52 of the sub primary coil magnetic flux generation state switching unit 5 are simultaneously turned on to add the main primary current I1a to the sub primary primary direction of the first direction. The current I1b1 flows. At this time, when the current I1b1 in the first direction flows in the sub primary coil 111b, a forward magnetic flux in the same direction as the magnetic flux generated in the main primary coil 111a is generated in the sub primary coil 111b.

  As time passes from energization of main primary coil 111a and secondary primary coil 111b, primary primary current I1a and secondary primary current I1b increase until saturation current is reached, and energy is applied to primary primary coil 111a and secondary primary coil 111b. Will be accumulated. Then, when the ignition signal Si and the first direction energization instruction signal S1d are simultaneously turned off at the ignition timing, an electromotive force corresponding to the energy stored in the main primary coil 111a and the secondary primary coil 111b is generated on the secondary side. As the next current I2 flows, dielectric breakdown occurs between the electrodes of the spark plug 2 to generate a discharge spark in the cylinder.

  Here, by simultaneously interrupting the primary primary current I1a and the secondary primary current I1b, the discharge energy given to the secondary coil 112 is given to the secondary coil 112 only from the main primary coil 111a in the above-described main / normal discharge control. Since the energy is larger than the discharge energy (the portion shown by hatching in the secondary current waveform in FIG. 3), the applied voltage causing the capacitive discharge is increased by that amount, and a large secondary current I2 flows. Therefore, if the ignition control means 31 performs superimposed discharge control before ignition timing, the discharge energy to be given to the secondary side is increased without lengthening the ON time of the ignition signal Si, and a high discharge current is obtained for a longer time. It can flow to the spark plug 2.

  Note that with pre-ignition timing superimposed discharge control, energy stored in the primary side using the secondary primary coil 111b is superimposed before ignition timing that generates discharge energy on the secondary side by current interruption on the primary side. It means control to cause the spark plug 2 to generate a discharge spark by the discharge energy generated on the secondary side by the current interruption on the primary side.

  This pre-ignition superimposed discharge control is not necessarily applicable only to increase the discharge energy given to the secondary side. For example, when the main primary coil 111a and the main switch element 12 are likely to be damaged by heat, superimposing discharge control before ignition timing using the sub primary coil 111b is performed, so that the main primary coil 111a and the main switch element 12 are You can reduce the burden.

  Specifically, the ignition control means 3 generates the short time ignition signal Si 'and the short time first direction energization instruction signal so that the ON time appropriately shorter than the ON time of the ignition signal Si required in the main normal discharge control is obtained. By outputting S1d ', the time for flowing the main primary current I1a and the sub primary current I1 b1 in the first direction to the main primary coil 111a and the sub primary coil 111b, respectively, is shortened, and the main primary coil 111a and the sub primary coil 111b are each Reduce the energy stored. In this way, the discharge energy given to the secondary side by interrupting the main primary current I1a and the secondary primary current I1b1 in the first direction may be made similar to the discharge energy given to the secondary side by the main normal discharge control. There is no problem in the discharge of the spark plug 2. In addition, the amount of heat generation of the main switch element 12 and the main primary coil 111a can be reduced by driving with the short time ignition signal Si '. Of course, even when it is necessary to supply more discharge energy to the secondary side, the load ratio of the main primary coil 111a and the sub-primary coil 111b can be appropriately adjusted to provide the main switch element 12 and the main primary coil 111a. There is an advantage that a necessary and sufficiently high current period can be secured while suppressing the occurrence of excessive heat generation.

  In the above-described superimposed discharge control before ignition timing, by raising the electromotive force generated on the secondary side by interrupting the current on the primary side, a high current flows at once on the secondary side to cause a capacitive discharge, but in the subsequent inductive discharge Since the period in which the high secondary current can be maintained does not increase dramatically, it can not always be said that the fuel efficiency is good as control for supplying a high discharge current to the spark plug 2 for a longer time. Thus, in the internal combustion engine ignition device 1 according to the present embodiment, the secondary high-current period can be extended without prolonging the ON time of the ignition signal Si by using the sub-primary coil 111b. It is possible.

  FIG. 4 switches the secondary primary coil magnetic flux generation state switching unit 5 to the reverse magnetic flux generation state after ignition timing by energization / detachment to the main primary coil 111a and starts energization to the secondary primary coil 111b after ignition timing superposition. It shows discharge control, and it is necessary to maintain induction discharge from secondary primary coil 111b after ignition timing to give discharge energy to secondary side by energization / shutdown control to primary side during one combustion cycle. It is control which gives sufficient energy to the secondary side.

  First, when the ignition signal Si is turned ON at a predetermined timing in the combustion cycle, the main switch element 12 is turned ON, and the main primary current I1a flows. When the ignition signal Si is turned ON, the first auxiliary switch element 51 of the auxiliary primary coil flux generation state switching unit 5 is also turned ON, and the second end 111b2 side of the auxiliary primary coil 111b is connected to the ground point GND. However, since the first direction energization instruction signal S1d remains OFF, energization of the sub primary coil 111b in the first direction is not performed.

  As time passes from the energization of the main primary coil 111a, the main primary current I1a increases until it reaches a saturation current, and energy is stored in the main primary coil 111a. Then, when the ignition signal Si is turned off at the ignition timing (when the signal level changes from H to L), an electromotive force corresponding to the energy stored in the main primary coil 111a is generated on the secondary side, and the secondary current I2 is As it flows, dielectric breakdown occurs between the electrodes of the spark plug 2 and discharge sparks occur in the cylinder (capacitive discharge).

  As described above, after the capacitive discharge occurs in the spark plug 2 and the discharge current starts to flow, for example, the ignition control means 31 turns on the second direction energization permission signal S2p at the timing of transition from capacitive discharge to inductive discharge. For example, the signal level is changed from L to H, and the second direction energization instruction signal S2d is turned ON. In the example shown in FIG. 4, the power supplied to the sub primary coil 111b is adjusted by performing PWM control to change the duty ratio of the second direction energization instruction signal S2d.

  Then, the secondary primary current I1b2 in the second direction flowing through the secondary primary coil 111b gradually increases until reaching the saturation current, and the magnetic flux in the reverse direction (same direction as the magnetic field generated in the secondary coil 112 after the ignition timing) The magnetic flux) also increases (indicated by hatching in the secondary primary coil current waveform in FIG. 4). Therefore, the reverse magnetic flux generated in secondary primary coil 111b acts on secondary coil 112 to compensate for the decrease in secondary current I2 due to the release of electromagnetic energy of secondary coil 112, and secondary current I2 is high. It is possible to maintain the current as it is (indicated by hatching in the secondary current waveform in FIG. 4), and it is possible to efficiently prolong the high current period suitable for in-cylinder combustion.

  After that, when the maintenance period (high current period) of high current necessary and sufficient for suitable in-cylinder combustion elapses, the ignition control means 31 turns off the second direction energization permission signal S2p and the second direction energization instruction signal S2d at that timing. Make it As a result, the magnetic flux in the reverse direction from the secondary primary coil 111b does not act on the secondary coil 112, and thereafter the low secondary current I2 flows only by the electromagnetic energy release of the secondary coil 112, and eventually the secondary current I2 Returns to zero.

  As described above, if the ignition control means 31 performs the superimposed discharge control after the ignition timing, the discharge energy to be given to the secondary coil 112 is increased without increasing the ON time of the ignition signal Si. Can extend the period during which the discharge current flowing through can be maintained at a high current. In addition, the magnetic flux in the reverse direction to be applied to the secondary coil 112 from the secondary primary coil 111b is sufficient to generate and maintain a high current necessary and sufficient for suitably maintaining the combustion in the cylinder, so the secondary primary coil 111b The energy required to energize the motor can be kept low, which is effective for improving the fuel efficiency. In addition, in the internal combustion engine ignition device 1 of the present embodiment, since the ignition control means 31 can perform PWM control of the fourth switch element 54 of the sub primary coil magnetic flux generation state switching unit 5, superimposed discharge control after ignition timing By appropriately increasing or decreasing the secondary primary current I1b2 in the second direction flowing through the secondary primary coil 111b, appropriate discharge energy without excess or deficiency can be provided to the secondary side, and further improvement of fuel efficiency can be expected.

  Note that with post-ignition superimposed discharge control, energy given to the secondary side is superimposed using the secondary primary coil 111b after ignition timing that discharge energy is generated on the secondary side by current interruption on the primary side, This means control for maintaining the discharge generated in the spark plug 2 for a necessary and sufficient period.

  The timing at which the secondary primary current I1b2 in the second direction starts flowing to the secondary primary coil 111b may be after the ignition timing, and is not particularly limited. For example, it may be performed simultaneously with the current interruption to the main primary coil 111a, or the secondary primary current I1b2 may be made to flow after a predetermined time has elapsed since the current interruption of the primary side. When the next current I2 reaches a predetermined judgment value (for example, the value of the secondary current considered to be high below the high current value at which the discharge current flowing through the spark plug 2 can maintain discharge spark formation suitable for in-cylinder combustion) The sub-primary current I1b2 may be supplied.

  The above-described pre-ignition superimposed discharge control and the post-ignition superimposed discharge control superimpose the discharge energy on the secondary side using the same sub-primary coil 111b, but the control is performed before the ignition timing and after the ignition timing Because they are separated, it is possible to carry out both controls during one combustion cycle.

  FIG. 5 shows the case of performing the post-ignition superimposed discharge control after performing the pre-ignition superimposed discharge control, and stored in both the main primary coil 111a and the secondary primary coil 111b during one combustion cycle. After energy is applied to the secondary coil 112 at a stretch, control is further performed to provide the secondary side with sufficient energy necessary to maintain the inductive discharge from the secondary primary coil 111b.

  That is, by simultaneously interrupting the primary primary current I1a and the secondary primary current I1b, the discharge energy given to the secondary side is equivalent to the addition of the secondary primary coil 111b (in the secondary primary coil waveform in FIG. In the secondary current waveform shown in FIG. 5, the voltage applied to the secondary side is increased (indicated by thin hatching in the secondary current waveform in FIG. 5), and the secondary primary coil 111b is further Only the amount of secondary primary current I1b2 (indicated by dark hatching in the secondary primary coil waveform in FIG. 5) acts on secondary coil 112, and secondary current I2 is maintained at high current (FIG. 5). In the secondary current waveform, shown by dark hatching).

  As described above, if the pre-ignition superimposed discharge control and the post-ignition superimposed discharge control are performed during one combustion cycle, discharge energy greater than that obtained when each control is performed alone can be given to the secondary side. Therefore, good and stable in-cylinder combustion can be realized even under severe operating conditions.

  According to the igniter 1 for an internal combustion engine according to the first embodiment described above, main normal discharge control, superimposed discharge control before ignition timing, superimposed discharge after ignition timing so as to be optimum according to the operating condition of the internal combustion engine Since control and pre-ignition superimposed discharge control + post-ignition superimposed discharge control can be properly used, it is possible to optimize the power consumption for ignition and expect a high fuel efficiency improvement effect.

  In addition, the ignition coil 11 used in the internal combustion engine ignition device 1 includes the main primary coil 111a and the sub primary coil 111b, but can be configured to have the same size as an existing ignition coil. Therefore, a plurality of coils and a booster circuit are not required to increase discharge energy to be supplied to the secondary side, and the ignition coil 11 having a size similar to that of the existing ignition coil may be used. Cost increase can be suppressed.

  The internal combustion engine ignition device 1 according to the first embodiment has a function for controlling the energization direction and the energization / shutoff of the secondary primary coil 111b, that is, the first to fourth secondary switch elements 51 to 54 as secondary primary coils. Although the magnetic flux generation state switching unit 5 is unitized, it is not limited to this. For example, since the first sub switch element 51 of the sub primary coil magnetic flux generation state switching unit 5 is turned on and off in synchronization with the main switch element 12 by the ignition signal Si, the signal path of the ignition signal Si is simplified. In order to make it possible to arrange the main switch element 12 and the first sub switch element 51 in close proximity to each other, it is conceivable.

  Therefore, in the internal combustion engine ignition device 1 'according to the second embodiment shown in FIG. 6, the first auxiliary switching element 51 is housed in the case 15 of the ignition coil unit 10'. A gate G which is a control terminal of the main switch element 12 and a gate G which is a control terminal of the first sub switch element 51 are connected to a fourth connection terminal 152d, and the internal combustion engine drive control device 3 via the fourth connection terminal 152d. The ignition signal from is input. In this way, the signal path of the ignition signal Si can be simplified. The main switch element 12 and the first auxiliary switch element 51 can achieve stable operation even if they are sealed integrally with the ignition coil 11 by using discrete components having high heat resistance and noise resistance. Further, the secondary primary coil magnetic flux generation state switching unit 5 'houses the second secondary switch element 52, the third secondary switch element 53, and the fourth secondary switch element 54 in one case to form a unit.

  Also in the internal combustion engine ignition device 1 'according to the second embodiment, the ignition control device 31 controls the ignition signal Si, the first direction energization instruction signal S1d, the second direction energization permission signal S2p, and the second direction energization instruction signal S2d. Is output to the ignition coil unit 10 or the secondary primary coil magnetic flux generation state switching unit 5 'at an appropriate timing to perform main normal discharge control similar to that of the internal combustion engine ignition device 1 of the first embodiment, superimposed discharge before ignition timing. Control, superimposed discharge control after ignition timing, superimposed discharge control before ignition timing + superimposed discharge control after ignition timing can be performed.

  In the internal combustion engine ignition device 1, 1 'according to the first and second embodiments described above, both the main switch element 12 and the first sub switch element 51 are controlled by the ignition signal Si, but the main switch element 12 and the first sub switch element 51 may be controlled to be ON / OFF by different signals.

  The internal combustion engine ignition device 1 ′ ′ of the third embodiment shown in FIG. 7 generates a main ignition signal Sia and a secondary ignition signal Sib by the ignition control means 31 ′ ′ of the internal combustion engine drive control device 3 ′ ′, and the main ignition signal Sia The main switch element 12 is ON / OFF controlled, and the first sub switch element 51 of the sub primary coil magnetic flux generation state switching unit 5 is ON / OFF controlled by the sub ignition signal Sib. It is possible to flow the sub-primary current I1b1 in the first direction through the sub-primary coil 111b without flowing the current I1a.

  The secondary normal discharge control performed by the internal combustion engine ignition device 1 ′ ′ of the third embodiment configured as described above is shown in FIG. 8. Secondary normal discharge control uses only the secondary primary coil 111b during one combustion cycle. It is a control to apply discharge energy to the secondary side, and is effective, for example, when the main primary coil 111a for performing the main normal discharge control and the main switch element 12 are damaged by heat generation.

  First, when the secondary ignition signal Sib and the first direction energization instruction signal S1p are turned ON at a predetermined timing in the combustion cycle, the first auxiliary switching device 51 is simultaneously turned ON, and the first auxiliary switching device 51 is simultaneously turned on. Secondary primary current I1b1 flows. The sub ignition signal Sib can not be controlled to flow the sub primary current I1 b by this signal alone, but the second end 111 b 2 of the sub primary coil 111 b is connected to the ground point GND side to supply power from the first end 111 b 1 This corresponds to the first direction energization permission signal S1p.

  As time passes from energization of the sub primary coil 111b, the sub primary current I1b1 in the first direction increases until it reaches a saturation current, and energy is stored in the sub primary coil 111b. Then, when the ignition signal Si is turned OFF at the ignition timing (when the signal level changes from H to L), an electromotive force corresponding to the energy stored in the secondary primary coil 111b is generated on the secondary side, and the secondary current I2 flows At the same time, a dielectric breakdown occurs between the electrodes of the spark plug 2 to generate a discharge spark in the cylinder.

  As described above, if secondary normal discharge control is performed, normal primary energy is applied to the secondary side by only the secondary primary coil 111b without using the primary primary coil 111a, and normal discharge is generated in the spark plug 2 Is possible. In the internal combustion engine ignition device 1 ′ ′ according to the third embodiment, the main primary coil 111a and the secondary primary coil 111b can be selectively used as coils for storing energy to be applied to the secondary side. It is possible to avoid excessive load on only the primary coil 111a and to effectively avoid accidental failure of the ignition coil 11. Further, for some reason, the main primary coil 111a in the ignition coil unit 10, the main switch element 12 or Even if one of the secondary primary coils 111b fails and primary normal discharge control or secondary normal discharge control becomes impossible, primary normal discharge control or secondary normal discharge control can be performed by the primary coil that normally functions. Therefore, the discharge of the ignition coil 2 can be secured, and the merit that the worst situation where the cylinder concerned can not be ignited can be avoided. A.

  Furthermore, in the internal combustion engine ignition device 1 ′ ′ according to the third embodiment, since the main ignition signal Sia and the sub ignition signal Sib can be controlled independently, the energization start timing to the sub primary coil 111 b by the sub ignition signal Si b is mainly The energy stored in the secondary primary coil 111b can be adjusted by controlling the ignition control means 31 so as to delay the current application start timing to the primary primary coil 111a by the ignition signal Sia, for example, the ON time of the primary ignition signal Sia. Then, if the energy stored in the main primary coil 111a is slightly insufficient, the ON time is set such that the energy shortage can be compensated by the auxiliary primary coil 111b without lengthening the ON time of the main ignition signal Sia. Necessary and sufficient energy is obtained by outputting the ignition signal Sib (and the first direction energization instruction signal S1d) Stable ignition control can be realized as it is accumulated in the main primary coil 111a and the sub-primary coil 111. Furthermore, since it is not necessary to lengthen the ON time of the main ignition signal Sia, heat generation of the main primary coil 111a and the main switch element 12 can be realized. It is also useful in that it can be reduced.

  When the DC power supply 4 is used as a DC power supply for supplying power to the main primary coil 111a and the sub primary coil 111b as in the internal combustion engine ignition device 1 ′ ′, the main primary coil 111a and the sub primary coil 111b By making the number of turns the same, it is possible to substantially equalize the discharge energy given to the secondary side by the main normal discharge control and the discharge energy given to the secondary side by the sub normal discharge control. If the number of turns of the sub primary coil 111b is smaller than the number of turns, a power supply with a higher voltage than the DC power supply 4 is used as a first power feeding means for supplying power to the sub primary coil 111b. By increasing the voltage applied to the sub-primary coil 111b, discharge energy equivalent to that of the main normal discharge control can be obtained also by the sub-normal discharge control. It is desirable to adjust as given to the secondary side.

  The internal combustion engine ignition devices 1, 1 ′, 1 ′ ′ according to the first to third embodiments described above each show only one cylinder, but in the case of an internal combustion engine configured with a plurality of cylinders, each cylinder A secondary primary coil magnetic flux generation state switching unit 5 may be provided, or a primary unit containing all of the first to fourth secondary switch elements 51 to 54 corresponding to each cylinder in a single case, and this primary unit and each cylinder And the ignition coil unit 10 may be connected.

  As mentioned above, although some embodiments of the ignition device for internal combustion engines concerning the present invention were described based on an accompanying drawing, the present invention is not limited to these embodiments, and is stated in a claim. In the range which does not change a structure, you may implement by diverting the well-known existing equivalent technical means.

1 Ignition Device for Internal Combustion Engine 10 Ignition Coil Unit 11 Ignition Coil 111a Main Primary Coil 111b Secondary Primary Coil 112 Secondary Coil 113 Center Core 12 Main Switch Element 15 Case 2 Spark Plug 3 Internal Combustion Engine Drive Control Device 31 Ignition Control Means 4 DC Power Supply 5 Secondary Primary Coil Magnetic Flux Generation State Switching Unit 51 First Secondary Switch Element 52 Second Secondary Switch Element 53 Third Secondary Switch Element 54 Fourth Secondary Switch Element

Claims (18)

Main primary coil whose forward magnetic flux is increased by energization and whose forward magnetic flux is reduced by interrupting current;
A secondary primary coil that generates a forward magnetic flux by energization in a first predetermined direction and generates a reverse magnetic flux in the reverse direction to the forward direction by energization in a second reverse direction;
A secondary coil whose one end is connected to a spark plug and a magnetic flux generated on the main primary coil and the secondary primary coil acts to generate discharge energy;
An ignition coil having
Main switch means for switching on / off of power from the battery to the main primary coil;
The forward magnetic flux generation state is capable of mutually switching between a forward magnetic flux generation state in which the secondary primary coil can be energized in the first direction and a reverse magnetic flux generation state in which the secondary primary coil can be energized in the second direction. Secondary primary coil flux generation state switching means comprising first secondary switch means used for switching control to the state;
Ignition control means for controlling the main switch means and the secondary primary coil magnetic flux generation state switching means to generate a discharge spark on the spark plug at a predetermined timing of the combustion cycle;
Equipped with
The ignition control means is
Main normal discharge control that generates discharge energy in the secondary coil is possible by controlling energization / cutoff to the main primary coil.
Pre-ignition overlapping discharge control to switch on the primary primary ignition coil and secondary primary ignition coil simultaneously by switching the secondary primary coil magnetic flux generation state switching means to forward magnetic flux generation state and / or secondary primary coil magnetic flux after ignition timing An ignition device for an internal combustion engine, which is capable of performing a post-ignition superimposed discharge control to switch an occurrence state switching means to a reverse magnetic flux generation state to energize and cut off an auxiliary primary ignition coil. The secondary primary coil magnetic flux generation state switching means
The first secondary switch means is used as a switch for switching the first end side of the secondary primary coil to the ground so that the secondary primary coil can be energized in the first direction.
Second sub switch means for enabling power supply from the first power supply means to the second end side of the sub primary coil so that current can be supplied to the sub primary coil in the first direction;
Third sub-switching means for switching the second end side of the sub-primary coil to ground so that the sub-primary coil can be energized in the second direction;
Fourth sub-switch means for enabling power supply from the second power supply means to the first end side of the sub primary coil so that current can be supplied to the sub primary coil in the second direction;
An ignition device for an internal combustion engine according to claim 1, comprising:   The ignition control means synchronizes ON / OFF control of the main switch means, the first sub switch means and the second sub switch means so that the main primary ignition coil and the sub primary ignition coil are simultaneously energized. The ignition device for an internal combustion engine according to claim 2, wherein superimposed discharge control is performed.   The ignition control means is generated in the secondary coil by performing ON / OFF control of the third sub-switch means and the fourth sub-switch means after ignition timing at which the main primary coil is energized / shutdown controlled. The ignition device for an internal combustion engine according to claim 2, wherein superimposed discharge control is performed after ignition timing to increase discharge energy in a superimposed manner. The ignition control means is
Pre-ignition superimposed discharge control to simultaneously energize the primary primary ignition coil and the secondary primary ignition coil by synchronizing ON / OFF control of the primary switch means, the first secondary switch means, and the second secondary switch means;
By performing ON / OFF control of the third sub switch means and the fourth sub switch means after the ignition timing at which the superimposed discharge control before the ignition timing is performed, the discharge energy generated in the secondary coil is increased in a superimposed manner Superimposed discharge control after ignition timing,
3. The igniter for an internal combustion engine according to claim 2, characterized in that the operation is performed in the same combustion cycle.   The ignition signal output from the ignition control means is simultaneously input to the main switch means and the first sub switch means so that ON / OFF operations of the main switch means and the first sub switch means are synchronized. The ignition device for an internal combustion engine according to any one of claims 3 to 5, characterized in that   Among the sub-primary coil magnetic flux generation state switching means, at least the second sub-switch means, the third sub-switch means and the fourth sub-switch means are housed in one case to be unitized. The ignition device for an internal combustion engine according to any one of claims 2 to 6.   The ignition device for an internal combustion engine according to any one of claims 1 to 7, wherein the main switch means and the first auxiliary switch means are housed in a case of an ignition coil.   A control terminal for controlling ON / OFF of the main switch means and the first sub switch means is connected in a case of an ignition coil, and an external connection terminal connected to the ignition control means is shared. An ignition device for an internal combustion engine according to claim 8.   The ignition control means switches the secondary primary coil magnetic flux generation state switching means to the forward magnetic flux generation state, and instead of the main discharge control, discharge energy is generated in the secondary coil by control of energizing / shutting off the secondary primary coil. The ignition device for an internal combustion engine according to claim 1, characterized in that auxiliary secondary discharge control is possible.   The ignition control means switches to a forward magnetic flux generation state by synchronizing ON / OFF control of the first sub switch means and the second sub switch means, and instead of the main discharge control, switching to the forward primary flux control state is performed to the sub primary coil. 3. The ignition device for an internal combustion engine according to claim 2, wherein secondary normal discharge control for generating discharge energy in the secondary coil is performed by energization / shutdown control.   The ignition control means synchronizes ON / OFF control of the main switch means, the first sub switch means and the second sub switch means so that the main primary ignition coil and the sub primary ignition coil are simultaneously energized. The ignition device for an internal combustion engine according to claim 11, wherein superimposed discharge control is performed.   The ignition control means is generated in the secondary coil by performing ON / OFF control of the third sub switch means and the fourth sub switch means after the ignition timing at which the main normal discharge control or the sub normal discharge control is performed. The ignition device for an internal combustion engine according to claim 11, wherein superimposed discharge control after ignition timing is performed to increase discharge energy in a superimposed manner. The ignition control means is
Pre-ignition superimposed discharge control to simultaneously energize the primary primary ignition coil and the secondary primary ignition coil by synchronizing ON / OFF control of the primary switch means, the first secondary switch means, and the second secondary switch means;
By performing ON / OFF control of the third sub switch means and the fourth sub switch means after the ignition timing at which the superimposed discharge control before the ignition timing is performed, the discharge energy generated in the secondary coil is increased in a superimposed manner Superimposed discharge control after ignition timing,
12. The igniter for an internal combustion engine according to claim 11, characterized in that the operation is performed in the same combustion cycle.   The ignition control means synchronizes the ON / OFF operation of the main switch means and the first auxiliary switch means by outputting the main ignition signal to the main switch means and the auxiliary ignition signal to the first auxiliary switch means. The ignition device for an internal combustion engine according to any one of claims 11 to 14, characterized in that:   The battery used in the power supply to the main primary coil is shared by the first power supply unit, according to any one of claims 2 to 7, 11 to 15, An ignition device for an internal combustion engine as described above.   The ignition control means performs PWM control on the fourth switch means of the sub primary coil magnetic flux generation state switching means to adjust the power supplied from the second power supply means to the sub primary coil. An ignition device for an internal combustion engine according to any one of claims 2 to 7 and claims 11 to 16.   18. The apparatus according to claim 1, wherein at least the secondary primary coil magnetic flux generation state switching means is housed in one case and unitized. An ignition device for an internal combustion engine according to item 1.

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